<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://unpkg.com/vue"></script>

<script>
    window.onload= function () {
        var data = {counter: 0}
        Vue.component('child', {

            props: ['myMessage'],

            template: '<span>{{ myMessage }}</span>'
        }),

        Vue.component('simple-counter', {
            template: '<button v-on:click="counter += 1">{{ counter }}</button>',

            data: function () {
                return {
                    counter: 0,
                }
            }


        })
        new Vue({
            el: '#example-2',
            data:{
                parentMsg:''
            }
        })
    }
</script>
</head>
<body>
<div  id="example-2">
    <input v-model="parentMsg">
    <br>
    <child v-bind:my-message="parentMsg"></child>
<br>
    <simple-counter></simple-counter>
    <simple-counter></simple-counter>
    <simple-counter></simple-counter>
</div>

</body>
</html>